norm2.hpp

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#ifndef STAN_MATH_PRIM_FUN_NORM2_HPP
#define STAN_MATH_PRIM_FUN_NORM2_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
 
namespace stan {
namespace math {
 
template <typename T, require_eigen_vt<std::is_arithmetic, T>* = nullptr>
inline double norm2(const T& v) {
  ref_type_t<T> v_ref = v;
  return v_ref.template lpNorm<2>();
}
 
template <typename Container, require_std_vector_t<Container>* = nullptr>
inline auto norm2(const Container& x) {
  return apply_vector_unary<Container>::reduce(
      x, [](const auto& v) { return norm2(v); });
}
 
}  // namespace math
}  // namespace stan
 
#endif